help ? when do early signs start ,,,,2weeks of conceiving????

Hiya please can any one help ,,,i stopped my contraceptive injection because it was good for me on 3rd aug and got the pill instead ,,,however i had sex with hubby that night out of blue even though with 2 children never had time for it,,ironic we did that night anyhow i finding im feeling a it sick but its only been 2 weeks surely this cant be that can it,,,,i have a 2 yr old and a 10 month old with my hands totlaly full,,,i hope not but if i was what wil i do,,i lost my first born 4 yrs ago a boys at birth and cannot bear abortions but but but a 4th ceasarean is not recommened especially all been 1 /2 yr apart.....stuck my hubby is scared and says im being stupid and thinks i just want a boy but he doesnt understand im so emotionally scared

im scared i havent had period regul;ar with injection for 9 months so dont know thing is can a test tell u even if u have nt missed a period? of dear im on anti depressant for pnd already i am stressing ???

i was told it takes ages for u get preg after coming off injection but i cant believe just my luk if i have after 9 months of no sx i go and do it on day of it finishing and starting a pill........oh dear i hope im not not yet anyway mayb in 3 4 yrs,,,

i think what ever the consequence ill be ok,,,i think i love my two girls and did plan on not having any more yet,,,but well have to see, got hubby to pik a test up 4 me tonight will test in morn 2mrw,,,,